Results 21 to 30 of about 264,425 (308)

SUPERMASSIVE SEEDS FOR SUPERMASSIVE BLACK HOLES [PDF]

The Astrophysical Journal, 2013
9 pages, 2 figures; accepted for publication in ...
Hui Li, Daniel E. Holz, Jarrett L. Johnson, Daniel J. Whalen, Daniel J. Whalen   +4 more
openaire   +3 more sources

The ngEHT’s Role in Measuring Supermassive Black Hole Spins

Galaxies, 2022
While supermassive black-hole masses have been cataloged across cosmic time, only a few dozen of them have robust spin measurements. By extending and improving the existing Event Horizon Telescope (EHT) array, the next-generation Event Horizon Telescope (
Angelo Ricarte, Paul Tiede, Razieh Emami, Aditya Tamar, Priyamvada Natarajan   +4 more
doaj   +1 more source

The contribution of supermassive black holes in stripped nuclei to the supermassive black hole population of UCDs and galaxy clusters [PDF]

MNRAS, 527, 4643-4656 (2024), 2023
We use the hydrodynamic EAGLE simulation to predict the numbers and masses of supermassive black holes in remnant nuclei of disrupted galaxies (stripped nuclei) and compare these to confirmed measurements of black holes in observed ultra-compact dwarf galaxies (UCDs).
arxiv   +1 more source

Decomposition of the central structure of NGC 2273 in the NIR: A case study

Astronomische Nachrichten, Volume 344, Issue 10, December 2023., 2023
Abstract The Seyfert 2 galaxy NGC 2273 is a prime target to explore how active nuclei can be fed. It has a star‐forming innermost nuclear ring with a radius of 0.33kpc from where material may be funneled to the supermassive black hole in its center. In this article, we discuss high‐resolution adaptive optics aided JHKs images of NGC 2273 taken with the
L. Schey, J. Heidt, A. Pramskiy, D. Thompson, G. Agapito, S. Esposito, R. Gredel, D. Miller, E. Pinna, A. Puglisi, F. Rossi, W. Seifert, G. Taylor, A. Quirrenbach   +13 more
wiley   +1 more source

Supermassive black holes in BCGs [PDF]

Proceedings of the International Astronomical Union, 2006
AbstractWe observed a sample of three Brightest Cluster Galaxies (BCGs), Abell 1836-BCG, Abell 2052-BCG, and Abell 3565-BCG, with the Advanced Camera for Surveys (ACS) and the Imaging Spectrograph (STIS) on board the Space Telescope. For each target galaxy we obtained high-resolution spectroscopy of the Hα and [N II] λ6583 emission lines at three slit ...
Jordi Miralda-Escudé, L. Coccato, E. Dalla Bontà, E. Dalla Bontà, Laura Ferrarese, Alessandro Pizzella, Enrico Maria Corsini   +6 more
openaire   +5 more sources

On the Formation and Interaction of Multiple Supermassive Stars in Cosmological Flows

The Astrophysical Journal, 2023
Supermassive primordial stars with masses exceeding ∼10 ^5 M _⊙ that form in atomically cooled halos are the leading candidates for the origin of high-redshift quasars at z > 6.
Tyrone E. Woods, Samuel Patrick, Daniel J. Whalen, Alexander Heger   +3 more
doaj   +1 more source

First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole [PDF]

, 2019
When surrounded by a transparent emission region, black holes are expected to reveal a dark shadow caused by gravitational light bending and photon capture at the event horizon.
The Event Horizon Telescope Collaboration
semanticscholar   +1 more source

The potsdam arrayed waveguide spectrograph: A demonstrator of a cross‐dispersed integrated photonic spectrograph developed for the astronomical H‐band

Astronomische Nachrichten, Volume 344, Issue 8-9, October-November 2023., 2023
The Potsdam Arrayed Waveguide Spectrograph (PAWS) is based on an integrated photonic spectrograph designed and developed by innoFSPEC to work in the astronomical H‐band. PAWS demonstrates how a traditional bulk optics spectrograph can be miniaturized and additionally serves as a tool for testing in‐house developed astrophotonical devices.
Eloy Hernandez, Alan Günther, Andreas Stoll, Svend‐Marian Bauer, Stella Vješnica, Kalaga Madhav, Martin M. Roth   +6 more
wiley   +1 more source

Supermassive black holes and their environments [PDF]

Monthly Notices of the Royal Astronomical Society, 2008
We make use of the first high--resolution hydrodynamic simulations of structure formation which self-consistently follows the build up of supermassive black holes introduced in Di Matteo et al. (2007) to investigate the relation between black holes (BH), host halo and large--scale environment.
Tiziana Di Matteo, Jörg M. Colberg, Jörg M. Colberg   +2 more
openaire   +3 more sources

An Upper Limit on the Charge of the Black Hole Sgr A* from EHT Observations

The Astrophysical Journal, 2023
The Event Horizon Telescope (EHT) recently released an image of the supermassive black hole Sgr A* showing an angular shadow diameter d _sh = 48.7 ± 7 μ as and Schwarzschild shadow deviation $\delta =-{0.08}_{-0.09}^{+0.09}\,(\mathrm{VLTI})$ , $-{0.04}_{-
Sushant G. Ghosh, Misba Afrin
doaj   +1 more source